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![Rikard Falkeborn](/assets/img/avatar_default.png)
The only usage of these is to put their addresses in arrays of pointers to const attribute_groups. Make them const to allow the compiler to put them in read-only memory. Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com> Link: https://lore.kernel.org/r/20210108221512.18811-1-rikard.falkeborn@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1488 lines
35 KiB
C
1488 lines
35 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* core.c - Implementation of core module of MOST Linux driver stack
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*
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* Copyright (C) 2013-2020 Microchip Technology Germany II GmbH & Co. KG
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/poll.h>
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#include <linux/wait.h>
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#include <linux/kobject.h>
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#include <linux/mutex.h>
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#include <linux/completion.h>
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#include <linux/sysfs.h>
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#include <linux/kthread.h>
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#include <linux/dma-mapping.h>
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#include <linux/idr.h>
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#include <linux/most.h>
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#define MAX_CHANNELS 64
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#define STRING_SIZE 80
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static struct ida mdev_id;
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static int dummy_num_buffers;
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static struct list_head comp_list;
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struct pipe {
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struct most_component *comp;
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int refs;
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int num_buffers;
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};
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struct most_channel {
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struct device dev;
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struct completion cleanup;
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atomic_t mbo_ref;
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atomic_t mbo_nq_level;
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u16 channel_id;
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char name[STRING_SIZE];
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bool is_poisoned;
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struct mutex start_mutex; /* channel activation synchronization */
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struct mutex nq_mutex; /* nq thread synchronization */
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int is_starving;
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struct most_interface *iface;
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struct most_channel_config cfg;
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bool keep_mbo;
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bool enqueue_halt;
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struct list_head fifo;
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spinlock_t fifo_lock; /* fifo access synchronization */
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struct list_head halt_fifo;
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struct list_head list;
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struct pipe pipe0;
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struct pipe pipe1;
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struct list_head trash_fifo;
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struct task_struct *hdm_enqueue_task;
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wait_queue_head_t hdm_fifo_wq;
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};
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#define to_channel(d) container_of(d, struct most_channel, dev)
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struct interface_private {
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int dev_id;
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char name[STRING_SIZE];
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struct most_channel *channel[MAX_CHANNELS];
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struct list_head channel_list;
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};
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static const struct {
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int most_ch_data_type;
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const char *name;
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} ch_data_type[] = {
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{ MOST_CH_CONTROL, "control" },
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{ MOST_CH_ASYNC, "async" },
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{ MOST_CH_SYNC, "sync" },
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{ MOST_CH_ISOC, "isoc"},
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{ MOST_CH_ISOC, "isoc_avp"},
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};
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/**
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* list_pop_mbo - retrieves the first MBO of the list and removes it
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* @ptr: the list head to grab the MBO from.
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*/
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#define list_pop_mbo(ptr) \
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({ \
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struct mbo *_mbo = list_first_entry(ptr, struct mbo, list); \
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list_del(&_mbo->list); \
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_mbo; \
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})
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/**
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* most_free_mbo_coherent - free an MBO and its coherent buffer
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* @mbo: most buffer
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*/
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static void most_free_mbo_coherent(struct mbo *mbo)
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{
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struct most_channel *c = mbo->context;
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u16 const coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len;
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if (c->iface->dma_free)
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c->iface->dma_free(mbo, coherent_buf_size);
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else
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kfree(mbo->virt_address);
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kfree(mbo);
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if (atomic_sub_and_test(1, &c->mbo_ref))
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complete(&c->cleanup);
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}
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/**
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* flush_channel_fifos - clear the channel fifos
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* @c: pointer to channel object
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*/
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static void flush_channel_fifos(struct most_channel *c)
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{
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unsigned long flags, hf_flags;
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struct mbo *mbo, *tmp;
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if (list_empty(&c->fifo) && list_empty(&c->halt_fifo))
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return;
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spin_lock_irqsave(&c->fifo_lock, flags);
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list_for_each_entry_safe(mbo, tmp, &c->fifo, list) {
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list_del(&mbo->list);
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spin_unlock_irqrestore(&c->fifo_lock, flags);
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most_free_mbo_coherent(mbo);
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spin_lock_irqsave(&c->fifo_lock, flags);
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}
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spin_unlock_irqrestore(&c->fifo_lock, flags);
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spin_lock_irqsave(&c->fifo_lock, hf_flags);
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list_for_each_entry_safe(mbo, tmp, &c->halt_fifo, list) {
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list_del(&mbo->list);
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spin_unlock_irqrestore(&c->fifo_lock, hf_flags);
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most_free_mbo_coherent(mbo);
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spin_lock_irqsave(&c->fifo_lock, hf_flags);
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}
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spin_unlock_irqrestore(&c->fifo_lock, hf_flags);
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if (unlikely((!list_empty(&c->fifo) || !list_empty(&c->halt_fifo))))
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dev_warn(&c->dev, "Channel or trash fifo not empty\n");
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}
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/**
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* flush_trash_fifo - clear the trash fifo
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* @c: pointer to channel object
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*/
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static int flush_trash_fifo(struct most_channel *c)
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{
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struct mbo *mbo, *tmp;
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unsigned long flags;
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spin_lock_irqsave(&c->fifo_lock, flags);
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list_for_each_entry_safe(mbo, tmp, &c->trash_fifo, list) {
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list_del(&mbo->list);
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spin_unlock_irqrestore(&c->fifo_lock, flags);
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most_free_mbo_coherent(mbo);
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spin_lock_irqsave(&c->fifo_lock, flags);
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}
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spin_unlock_irqrestore(&c->fifo_lock, flags);
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return 0;
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}
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static ssize_t available_directions_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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unsigned int i = c->channel_id;
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strcpy(buf, "");
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if (c->iface->channel_vector[i].direction & MOST_CH_RX)
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strcat(buf, "rx ");
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if (c->iface->channel_vector[i].direction & MOST_CH_TX)
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strcat(buf, "tx ");
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strcat(buf, "\n");
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return strlen(buf);
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}
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static ssize_t available_datatypes_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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unsigned int i = c->channel_id;
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strcpy(buf, "");
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if (c->iface->channel_vector[i].data_type & MOST_CH_CONTROL)
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strcat(buf, "control ");
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if (c->iface->channel_vector[i].data_type & MOST_CH_ASYNC)
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strcat(buf, "async ");
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if (c->iface->channel_vector[i].data_type & MOST_CH_SYNC)
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strcat(buf, "sync ");
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if (c->iface->channel_vector[i].data_type & MOST_CH_ISOC)
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strcat(buf, "isoc ");
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strcat(buf, "\n");
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return strlen(buf);
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}
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static ssize_t number_of_packet_buffers_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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unsigned int i = c->channel_id;
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return snprintf(buf, PAGE_SIZE, "%d\n",
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c->iface->channel_vector[i].num_buffers_packet);
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}
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static ssize_t number_of_stream_buffers_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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unsigned int i = c->channel_id;
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return snprintf(buf, PAGE_SIZE, "%d\n",
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c->iface->channel_vector[i].num_buffers_streaming);
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}
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static ssize_t size_of_packet_buffer_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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unsigned int i = c->channel_id;
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return snprintf(buf, PAGE_SIZE, "%d\n",
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c->iface->channel_vector[i].buffer_size_packet);
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}
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static ssize_t size_of_stream_buffer_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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unsigned int i = c->channel_id;
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return snprintf(buf, PAGE_SIZE, "%d\n",
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c->iface->channel_vector[i].buffer_size_streaming);
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}
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static ssize_t channel_starving_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n", c->is_starving);
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}
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static ssize_t set_number_of_buffers_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.num_buffers);
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}
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static ssize_t set_buffer_size_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.buffer_size);
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}
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static ssize_t set_direction_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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if (c->cfg.direction & MOST_CH_TX)
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return snprintf(buf, PAGE_SIZE, "tx\n");
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else if (c->cfg.direction & MOST_CH_RX)
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return snprintf(buf, PAGE_SIZE, "rx\n");
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return snprintf(buf, PAGE_SIZE, "unconfigured\n");
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}
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static ssize_t set_datatype_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int i;
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struct most_channel *c = to_channel(dev);
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for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
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if (c->cfg.data_type & ch_data_type[i].most_ch_data_type)
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return snprintf(buf, PAGE_SIZE, "%s",
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ch_data_type[i].name);
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}
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return snprintf(buf, PAGE_SIZE, "unconfigured\n");
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}
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static ssize_t set_subbuffer_size_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.subbuffer_size);
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}
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static ssize_t set_packets_per_xact_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_channel *c = to_channel(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.packets_per_xact);
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}
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static ssize_t set_dbr_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct most_channel *c = to_channel(dev);
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return snprintf(buf, PAGE_SIZE, "%d\n", c->cfg.dbr_size);
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}
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#define to_dev_attr(a) container_of(a, struct device_attribute, attr)
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static umode_t channel_attr_is_visible(struct kobject *kobj,
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struct attribute *attr, int index)
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{
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struct device_attribute *dev_attr = to_dev_attr(attr);
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struct device *dev = kobj_to_dev(kobj);
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struct most_channel *c = to_channel(dev);
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if (!strcmp(dev_attr->attr.name, "set_dbr_size") &&
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(c->iface->interface != ITYPE_MEDIALB_DIM2))
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return 0;
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if (!strcmp(dev_attr->attr.name, "set_packets_per_xact") &&
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(c->iface->interface != ITYPE_USB))
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return 0;
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return attr->mode;
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}
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#define DEV_ATTR(_name) (&dev_attr_##_name.attr)
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static DEVICE_ATTR_RO(available_directions);
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static DEVICE_ATTR_RO(available_datatypes);
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static DEVICE_ATTR_RO(number_of_packet_buffers);
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static DEVICE_ATTR_RO(number_of_stream_buffers);
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static DEVICE_ATTR_RO(size_of_stream_buffer);
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static DEVICE_ATTR_RO(size_of_packet_buffer);
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static DEVICE_ATTR_RO(channel_starving);
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static DEVICE_ATTR_RO(set_buffer_size);
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static DEVICE_ATTR_RO(set_number_of_buffers);
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static DEVICE_ATTR_RO(set_direction);
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static DEVICE_ATTR_RO(set_datatype);
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static DEVICE_ATTR_RO(set_subbuffer_size);
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static DEVICE_ATTR_RO(set_packets_per_xact);
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static DEVICE_ATTR_RO(set_dbr_size);
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static struct attribute *channel_attrs[] = {
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DEV_ATTR(available_directions),
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DEV_ATTR(available_datatypes),
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DEV_ATTR(number_of_packet_buffers),
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DEV_ATTR(number_of_stream_buffers),
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DEV_ATTR(size_of_stream_buffer),
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DEV_ATTR(size_of_packet_buffer),
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DEV_ATTR(channel_starving),
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DEV_ATTR(set_buffer_size),
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DEV_ATTR(set_number_of_buffers),
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DEV_ATTR(set_direction),
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DEV_ATTR(set_datatype),
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DEV_ATTR(set_subbuffer_size),
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DEV_ATTR(set_packets_per_xact),
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DEV_ATTR(set_dbr_size),
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NULL,
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};
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static const struct attribute_group channel_attr_group = {
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.attrs = channel_attrs,
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.is_visible = channel_attr_is_visible,
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};
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static const struct attribute_group *channel_attr_groups[] = {
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&channel_attr_group,
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NULL,
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};
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static ssize_t description_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_interface *iface = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%s\n", iface->description);
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}
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static ssize_t interface_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct most_interface *iface = dev_get_drvdata(dev);
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switch (iface->interface) {
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case ITYPE_LOOPBACK:
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return snprintf(buf, PAGE_SIZE, "loopback\n");
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case ITYPE_I2C:
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return snprintf(buf, PAGE_SIZE, "i2c\n");
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case ITYPE_I2S:
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return snprintf(buf, PAGE_SIZE, "i2s\n");
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case ITYPE_TSI:
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return snprintf(buf, PAGE_SIZE, "tsi\n");
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case ITYPE_HBI:
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return snprintf(buf, PAGE_SIZE, "hbi\n");
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case ITYPE_MEDIALB_DIM:
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return snprintf(buf, PAGE_SIZE, "mlb_dim\n");
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case ITYPE_MEDIALB_DIM2:
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return snprintf(buf, PAGE_SIZE, "mlb_dim2\n");
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case ITYPE_USB:
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return snprintf(buf, PAGE_SIZE, "usb\n");
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case ITYPE_PCIE:
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return snprintf(buf, PAGE_SIZE, "pcie\n");
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}
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return snprintf(buf, PAGE_SIZE, "unknown\n");
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}
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static DEVICE_ATTR_RO(description);
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static DEVICE_ATTR_RO(interface);
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static struct attribute *interface_attrs[] = {
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DEV_ATTR(description),
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DEV_ATTR(interface),
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NULL,
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};
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static const struct attribute_group interface_attr_group = {
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.attrs = interface_attrs,
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};
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static const struct attribute_group *interface_attr_groups[] = {
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&interface_attr_group,
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NULL,
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};
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static struct most_component *match_component(char *name)
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{
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struct most_component *comp;
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list_for_each_entry(comp, &comp_list, list) {
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if (!strcmp(comp->name, name))
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return comp;
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}
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return NULL;
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}
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struct show_links_data {
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int offs;
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char *buf;
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};
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static int print_links(struct device *dev, void *data)
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{
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struct show_links_data *d = data;
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int offs = d->offs;
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char *buf = d->buf;
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struct most_channel *c;
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struct most_interface *iface = dev_get_drvdata(dev);
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list_for_each_entry(c, &iface->p->channel_list, list) {
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if (c->pipe0.comp) {
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offs += scnprintf(buf + offs,
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PAGE_SIZE - offs,
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"%s:%s:%s\n",
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c->pipe0.comp->name,
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dev_name(iface->dev),
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dev_name(&c->dev));
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}
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if (c->pipe1.comp) {
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offs += scnprintf(buf + offs,
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PAGE_SIZE - offs,
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"%s:%s:%s\n",
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c->pipe1.comp->name,
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dev_name(iface->dev),
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dev_name(&c->dev));
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}
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}
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d->offs = offs;
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return 0;
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|
}
|
|
|
|
static int most_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
if (!strcmp(dev_name(dev), "most"))
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
static struct bus_type mostbus = {
|
|
.name = "most",
|
|
.match = most_match,
|
|
};
|
|
|
|
static ssize_t links_show(struct device_driver *drv, char *buf)
|
|
{
|
|
struct show_links_data d = { .buf = buf };
|
|
|
|
bus_for_each_dev(&mostbus, NULL, &d, print_links);
|
|
return d.offs;
|
|
}
|
|
|
|
static ssize_t components_show(struct device_driver *drv, char *buf)
|
|
{
|
|
struct most_component *comp;
|
|
int offs = 0;
|
|
|
|
list_for_each_entry(comp, &comp_list, list) {
|
|
offs += scnprintf(buf + offs, PAGE_SIZE - offs, "%s\n",
|
|
comp->name);
|
|
}
|
|
return offs;
|
|
}
|
|
|
|
/**
|
|
* get_channel - get pointer to channel
|
|
* @mdev: name of the device interface
|
|
* @mdev_ch: name of channel
|
|
*/
|
|
static struct most_channel *get_channel(char *mdev, char *mdev_ch)
|
|
{
|
|
struct device *dev = NULL;
|
|
struct most_interface *iface;
|
|
struct most_channel *c, *tmp;
|
|
|
|
dev = bus_find_device_by_name(&mostbus, NULL, mdev);
|
|
if (!dev)
|
|
return NULL;
|
|
put_device(dev);
|
|
iface = dev_get_drvdata(dev);
|
|
list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) {
|
|
if (!strcmp(dev_name(&c->dev), mdev_ch))
|
|
return c;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static
|
|
inline int link_channel_to_component(struct most_channel *c,
|
|
struct most_component *comp,
|
|
char *name,
|
|
char *comp_param)
|
|
{
|
|
int ret;
|
|
struct most_component **comp_ptr;
|
|
|
|
if (!c->pipe0.comp)
|
|
comp_ptr = &c->pipe0.comp;
|
|
else if (!c->pipe1.comp)
|
|
comp_ptr = &c->pipe1.comp;
|
|
else
|
|
return -ENOSPC;
|
|
|
|
*comp_ptr = comp;
|
|
ret = comp->probe_channel(c->iface, c->channel_id, &c->cfg, name,
|
|
comp_param);
|
|
if (ret) {
|
|
*comp_ptr = NULL;
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int most_set_cfg_buffer_size(char *mdev, char *mdev_ch, u16 val)
|
|
{
|
|
struct most_channel *c = get_channel(mdev, mdev_ch);
|
|
|
|
if (!c)
|
|
return -ENODEV;
|
|
c->cfg.buffer_size = val;
|
|
return 0;
|
|
}
|
|
|
|
int most_set_cfg_subbuffer_size(char *mdev, char *mdev_ch, u16 val)
|
|
{
|
|
struct most_channel *c = get_channel(mdev, mdev_ch);
|
|
|
|
if (!c)
|
|
return -ENODEV;
|
|
c->cfg.subbuffer_size = val;
|
|
return 0;
|
|
}
|
|
|
|
int most_set_cfg_dbr_size(char *mdev, char *mdev_ch, u16 val)
|
|
{
|
|
struct most_channel *c = get_channel(mdev, mdev_ch);
|
|
|
|
if (!c)
|
|
return -ENODEV;
|
|
c->cfg.dbr_size = val;
|
|
return 0;
|
|
}
|
|
|
|
int most_set_cfg_num_buffers(char *mdev, char *mdev_ch, u16 val)
|
|
{
|
|
struct most_channel *c = get_channel(mdev, mdev_ch);
|
|
|
|
if (!c)
|
|
return -ENODEV;
|
|
c->cfg.num_buffers = val;
|
|
return 0;
|
|
}
|
|
|
|
int most_set_cfg_datatype(char *mdev, char *mdev_ch, char *buf)
|
|
{
|
|
int i;
|
|
struct most_channel *c = get_channel(mdev, mdev_ch);
|
|
|
|
if (!c)
|
|
return -ENODEV;
|
|
for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
|
|
if (!strcmp(buf, ch_data_type[i].name)) {
|
|
c->cfg.data_type = ch_data_type[i].most_ch_data_type;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i == ARRAY_SIZE(ch_data_type))
|
|
dev_warn(&c->dev, "Invalid attribute settings\n");
|
|
return 0;
|
|
}
|
|
|
|
int most_set_cfg_direction(char *mdev, char *mdev_ch, char *buf)
|
|
{
|
|
struct most_channel *c = get_channel(mdev, mdev_ch);
|
|
|
|
if (!c)
|
|
return -ENODEV;
|
|
if (!strcmp(buf, "dir_rx")) {
|
|
c->cfg.direction = MOST_CH_RX;
|
|
} else if (!strcmp(buf, "rx")) {
|
|
c->cfg.direction = MOST_CH_RX;
|
|
} else if (!strcmp(buf, "dir_tx")) {
|
|
c->cfg.direction = MOST_CH_TX;
|
|
} else if (!strcmp(buf, "tx")) {
|
|
c->cfg.direction = MOST_CH_TX;
|
|
} else {
|
|
dev_err(&c->dev, "Invalid direction\n");
|
|
return -ENODATA;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int most_set_cfg_packets_xact(char *mdev, char *mdev_ch, u16 val)
|
|
{
|
|
struct most_channel *c = get_channel(mdev, mdev_ch);
|
|
|
|
if (!c)
|
|
return -ENODEV;
|
|
c->cfg.packets_per_xact = val;
|
|
return 0;
|
|
}
|
|
|
|
int most_cfg_complete(char *comp_name)
|
|
{
|
|
struct most_component *comp;
|
|
|
|
comp = match_component(comp_name);
|
|
if (!comp)
|
|
return -ENODEV;
|
|
|
|
return comp->cfg_complete();
|
|
}
|
|
|
|
int most_add_link(char *mdev, char *mdev_ch, char *comp_name, char *link_name,
|
|
char *comp_param)
|
|
{
|
|
struct most_channel *c = get_channel(mdev, mdev_ch);
|
|
struct most_component *comp = match_component(comp_name);
|
|
|
|
if (!c || !comp)
|
|
return -ENODEV;
|
|
|
|
return link_channel_to_component(c, comp, link_name, comp_param);
|
|
}
|
|
|
|
int most_remove_link(char *mdev, char *mdev_ch, char *comp_name)
|
|
{
|
|
struct most_channel *c;
|
|
struct most_component *comp;
|
|
|
|
comp = match_component(comp_name);
|
|
if (!comp)
|
|
return -ENODEV;
|
|
c = get_channel(mdev, mdev_ch);
|
|
if (!c)
|
|
return -ENODEV;
|
|
|
|
if (comp->disconnect_channel(c->iface, c->channel_id))
|
|
return -EIO;
|
|
if (c->pipe0.comp == comp)
|
|
c->pipe0.comp = NULL;
|
|
if (c->pipe1.comp == comp)
|
|
c->pipe1.comp = NULL;
|
|
return 0;
|
|
}
|
|
|
|
#define DRV_ATTR(_name) (&driver_attr_##_name.attr)
|
|
|
|
static DRIVER_ATTR_RO(links);
|
|
static DRIVER_ATTR_RO(components);
|
|
|
|
static struct attribute *mc_attrs[] = {
|
|
DRV_ATTR(links),
|
|
DRV_ATTR(components),
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group mc_attr_group = {
|
|
.attrs = mc_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *mc_attr_groups[] = {
|
|
&mc_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static struct device_driver mostbus_driver = {
|
|
.name = "most_core",
|
|
.bus = &mostbus,
|
|
.groups = mc_attr_groups,
|
|
};
|
|
|
|
static inline void trash_mbo(struct mbo *mbo)
|
|
{
|
|
unsigned long flags;
|
|
struct most_channel *c = mbo->context;
|
|
|
|
spin_lock_irqsave(&c->fifo_lock, flags);
|
|
list_add(&mbo->list, &c->trash_fifo);
|
|
spin_unlock_irqrestore(&c->fifo_lock, flags);
|
|
}
|
|
|
|
static bool hdm_mbo_ready(struct most_channel *c)
|
|
{
|
|
bool empty;
|
|
|
|
if (c->enqueue_halt)
|
|
return false;
|
|
|
|
spin_lock_irq(&c->fifo_lock);
|
|
empty = list_empty(&c->halt_fifo);
|
|
spin_unlock_irq(&c->fifo_lock);
|
|
|
|
return !empty;
|
|
}
|
|
|
|
static void nq_hdm_mbo(struct mbo *mbo)
|
|
{
|
|
unsigned long flags;
|
|
struct most_channel *c = mbo->context;
|
|
|
|
spin_lock_irqsave(&c->fifo_lock, flags);
|
|
list_add_tail(&mbo->list, &c->halt_fifo);
|
|
spin_unlock_irqrestore(&c->fifo_lock, flags);
|
|
wake_up_interruptible(&c->hdm_fifo_wq);
|
|
}
|
|
|
|
static int hdm_enqueue_thread(void *data)
|
|
{
|
|
struct most_channel *c = data;
|
|
struct mbo *mbo;
|
|
int ret;
|
|
typeof(c->iface->enqueue) enqueue = c->iface->enqueue;
|
|
|
|
while (likely(!kthread_should_stop())) {
|
|
wait_event_interruptible(c->hdm_fifo_wq,
|
|
hdm_mbo_ready(c) ||
|
|
kthread_should_stop());
|
|
|
|
mutex_lock(&c->nq_mutex);
|
|
spin_lock_irq(&c->fifo_lock);
|
|
if (unlikely(c->enqueue_halt || list_empty(&c->halt_fifo))) {
|
|
spin_unlock_irq(&c->fifo_lock);
|
|
mutex_unlock(&c->nq_mutex);
|
|
continue;
|
|
}
|
|
|
|
mbo = list_pop_mbo(&c->halt_fifo);
|
|
spin_unlock_irq(&c->fifo_lock);
|
|
|
|
if (c->cfg.direction == MOST_CH_RX)
|
|
mbo->buffer_length = c->cfg.buffer_size;
|
|
|
|
ret = enqueue(mbo->ifp, mbo->hdm_channel_id, mbo);
|
|
mutex_unlock(&c->nq_mutex);
|
|
|
|
if (unlikely(ret)) {
|
|
dev_err(&c->dev, "Buffer enqueue failed\n");
|
|
nq_hdm_mbo(mbo);
|
|
c->hdm_enqueue_task = NULL;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int run_enqueue_thread(struct most_channel *c, int channel_id)
|
|
{
|
|
struct task_struct *task =
|
|
kthread_run(hdm_enqueue_thread, c, "hdm_fifo_%d",
|
|
channel_id);
|
|
|
|
if (IS_ERR(task))
|
|
return PTR_ERR(task);
|
|
|
|
c->hdm_enqueue_task = task;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* arm_mbo - recycle MBO for further usage
|
|
* @mbo: most buffer
|
|
*
|
|
* This puts an MBO back to the list to have it ready for up coming
|
|
* tx transactions.
|
|
*
|
|
* In case the MBO belongs to a channel that recently has been
|
|
* poisoned, the MBO is scheduled to be trashed.
|
|
* Calls the completion handler of an attached component.
|
|
*/
|
|
static void arm_mbo(struct mbo *mbo)
|
|
{
|
|
unsigned long flags;
|
|
struct most_channel *c;
|
|
|
|
c = mbo->context;
|
|
|
|
if (c->is_poisoned) {
|
|
trash_mbo(mbo);
|
|
return;
|
|
}
|
|
|
|
spin_lock_irqsave(&c->fifo_lock, flags);
|
|
++*mbo->num_buffers_ptr;
|
|
list_add_tail(&mbo->list, &c->fifo);
|
|
spin_unlock_irqrestore(&c->fifo_lock, flags);
|
|
|
|
if (c->pipe0.refs && c->pipe0.comp->tx_completion)
|
|
c->pipe0.comp->tx_completion(c->iface, c->channel_id);
|
|
|
|
if (c->pipe1.refs && c->pipe1.comp->tx_completion)
|
|
c->pipe1.comp->tx_completion(c->iface, c->channel_id);
|
|
}
|
|
|
|
/**
|
|
* arm_mbo_chain - helper function that arms an MBO chain for the HDM
|
|
* @c: pointer to interface channel
|
|
* @dir: direction of the channel
|
|
* @compl: pointer to completion function
|
|
*
|
|
* This allocates buffer objects including the containing DMA coherent
|
|
* buffer and puts them in the fifo.
|
|
* Buffers of Rx channels are put in the kthread fifo, hence immediately
|
|
* submitted to the HDM.
|
|
*
|
|
* Returns the number of allocated and enqueued MBOs.
|
|
*/
|
|
static int arm_mbo_chain(struct most_channel *c, int dir,
|
|
void (*compl)(struct mbo *))
|
|
{
|
|
unsigned int i;
|
|
struct mbo *mbo;
|
|
unsigned long flags;
|
|
u32 coherent_buf_size = c->cfg.buffer_size + c->cfg.extra_len;
|
|
|
|
atomic_set(&c->mbo_nq_level, 0);
|
|
|
|
for (i = 0; i < c->cfg.num_buffers; i++) {
|
|
mbo = kzalloc(sizeof(*mbo), GFP_KERNEL);
|
|
if (!mbo)
|
|
goto flush_fifos;
|
|
|
|
mbo->context = c;
|
|
mbo->ifp = c->iface;
|
|
mbo->hdm_channel_id = c->channel_id;
|
|
if (c->iface->dma_alloc) {
|
|
mbo->virt_address =
|
|
c->iface->dma_alloc(mbo, coherent_buf_size);
|
|
} else {
|
|
mbo->virt_address =
|
|
kzalloc(coherent_buf_size, GFP_KERNEL);
|
|
}
|
|
if (!mbo->virt_address)
|
|
goto release_mbo;
|
|
|
|
mbo->complete = compl;
|
|
mbo->num_buffers_ptr = &dummy_num_buffers;
|
|
if (dir == MOST_CH_RX) {
|
|
nq_hdm_mbo(mbo);
|
|
atomic_inc(&c->mbo_nq_level);
|
|
} else {
|
|
spin_lock_irqsave(&c->fifo_lock, flags);
|
|
list_add_tail(&mbo->list, &c->fifo);
|
|
spin_unlock_irqrestore(&c->fifo_lock, flags);
|
|
}
|
|
}
|
|
return c->cfg.num_buffers;
|
|
|
|
release_mbo:
|
|
kfree(mbo);
|
|
|
|
flush_fifos:
|
|
flush_channel_fifos(c);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* most_submit_mbo - submits an MBO to fifo
|
|
* @mbo: most buffer
|
|
*/
|
|
void most_submit_mbo(struct mbo *mbo)
|
|
{
|
|
if (WARN_ONCE(!mbo || !mbo->context,
|
|
"Bad buffer or missing channel reference\n"))
|
|
return;
|
|
|
|
nq_hdm_mbo(mbo);
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_submit_mbo);
|
|
|
|
/**
|
|
* most_write_completion - write completion handler
|
|
* @mbo: most buffer
|
|
*
|
|
* This recycles the MBO for further usage. In case the channel has been
|
|
* poisoned, the MBO is scheduled to be trashed.
|
|
*/
|
|
static void most_write_completion(struct mbo *mbo)
|
|
{
|
|
struct most_channel *c;
|
|
|
|
c = mbo->context;
|
|
if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE)))
|
|
trash_mbo(mbo);
|
|
else
|
|
arm_mbo(mbo);
|
|
}
|
|
|
|
int channel_has_mbo(struct most_interface *iface, int id,
|
|
struct most_component *comp)
|
|
{
|
|
struct most_channel *c = iface->p->channel[id];
|
|
unsigned long flags;
|
|
int empty;
|
|
|
|
if (unlikely(!c))
|
|
return -EINVAL;
|
|
|
|
if (c->pipe0.refs && c->pipe1.refs &&
|
|
((comp == c->pipe0.comp && c->pipe0.num_buffers <= 0) ||
|
|
(comp == c->pipe1.comp && c->pipe1.num_buffers <= 0)))
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&c->fifo_lock, flags);
|
|
empty = list_empty(&c->fifo);
|
|
spin_unlock_irqrestore(&c->fifo_lock, flags);
|
|
return !empty;
|
|
}
|
|
EXPORT_SYMBOL_GPL(channel_has_mbo);
|
|
|
|
/**
|
|
* most_get_mbo - get pointer to an MBO of pool
|
|
* @iface: pointer to interface instance
|
|
* @id: channel ID
|
|
* @comp: driver component
|
|
*
|
|
* This attempts to get a free buffer out of the channel fifo.
|
|
* Returns a pointer to MBO on success or NULL otherwise.
|
|
*/
|
|
struct mbo *most_get_mbo(struct most_interface *iface, int id,
|
|
struct most_component *comp)
|
|
{
|
|
struct mbo *mbo;
|
|
struct most_channel *c;
|
|
unsigned long flags;
|
|
int *num_buffers_ptr;
|
|
|
|
c = iface->p->channel[id];
|
|
if (unlikely(!c))
|
|
return NULL;
|
|
|
|
if (c->pipe0.refs && c->pipe1.refs &&
|
|
((comp == c->pipe0.comp && c->pipe0.num_buffers <= 0) ||
|
|
(comp == c->pipe1.comp && c->pipe1.num_buffers <= 0)))
|
|
return NULL;
|
|
|
|
if (comp == c->pipe0.comp)
|
|
num_buffers_ptr = &c->pipe0.num_buffers;
|
|
else if (comp == c->pipe1.comp)
|
|
num_buffers_ptr = &c->pipe1.num_buffers;
|
|
else
|
|
num_buffers_ptr = &dummy_num_buffers;
|
|
|
|
spin_lock_irqsave(&c->fifo_lock, flags);
|
|
if (list_empty(&c->fifo)) {
|
|
spin_unlock_irqrestore(&c->fifo_lock, flags);
|
|
return NULL;
|
|
}
|
|
mbo = list_pop_mbo(&c->fifo);
|
|
--*num_buffers_ptr;
|
|
spin_unlock_irqrestore(&c->fifo_lock, flags);
|
|
|
|
mbo->num_buffers_ptr = num_buffers_ptr;
|
|
mbo->buffer_length = c->cfg.buffer_size;
|
|
return mbo;
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_get_mbo);
|
|
|
|
/**
|
|
* most_put_mbo - return buffer to pool
|
|
* @mbo: most buffer
|
|
*/
|
|
void most_put_mbo(struct mbo *mbo)
|
|
{
|
|
struct most_channel *c = mbo->context;
|
|
|
|
if (c->cfg.direction == MOST_CH_TX) {
|
|
arm_mbo(mbo);
|
|
return;
|
|
}
|
|
nq_hdm_mbo(mbo);
|
|
atomic_inc(&c->mbo_nq_level);
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_put_mbo);
|
|
|
|
/**
|
|
* most_read_completion - read completion handler
|
|
* @mbo: most buffer
|
|
*
|
|
* This function is called by the HDM when data has been received from the
|
|
* hardware and copied to the buffer of the MBO.
|
|
*
|
|
* In case the channel has been poisoned it puts the buffer in the trash queue.
|
|
* Otherwise, it passes the buffer to an component for further processing.
|
|
*/
|
|
static void most_read_completion(struct mbo *mbo)
|
|
{
|
|
struct most_channel *c = mbo->context;
|
|
|
|
if (unlikely(c->is_poisoned || (mbo->status == MBO_E_CLOSE))) {
|
|
trash_mbo(mbo);
|
|
return;
|
|
}
|
|
|
|
if (mbo->status == MBO_E_INVAL) {
|
|
nq_hdm_mbo(mbo);
|
|
atomic_inc(&c->mbo_nq_level);
|
|
return;
|
|
}
|
|
|
|
if (atomic_sub_and_test(1, &c->mbo_nq_level))
|
|
c->is_starving = 1;
|
|
|
|
if (c->pipe0.refs && c->pipe0.comp->rx_completion &&
|
|
c->pipe0.comp->rx_completion(mbo) == 0)
|
|
return;
|
|
|
|
if (c->pipe1.refs && c->pipe1.comp->rx_completion &&
|
|
c->pipe1.comp->rx_completion(mbo) == 0)
|
|
return;
|
|
|
|
most_put_mbo(mbo);
|
|
}
|
|
|
|
/**
|
|
* most_start_channel - prepares a channel for communication
|
|
* @iface: pointer to interface instance
|
|
* @id: channel ID
|
|
* @comp: driver component
|
|
*
|
|
* This prepares the channel for usage. Cross-checks whether the
|
|
* channel's been properly configured.
|
|
*
|
|
* Returns 0 on success or error code otherwise.
|
|
*/
|
|
int most_start_channel(struct most_interface *iface, int id,
|
|
struct most_component *comp)
|
|
{
|
|
int num_buffer;
|
|
int ret;
|
|
struct most_channel *c = iface->p->channel[id];
|
|
|
|
if (unlikely(!c))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&c->start_mutex);
|
|
if (c->pipe0.refs + c->pipe1.refs > 0)
|
|
goto out; /* already started by another component */
|
|
|
|
if (!try_module_get(iface->mod)) {
|
|
dev_err(&c->dev, "Failed to acquire HDM lock\n");
|
|
mutex_unlock(&c->start_mutex);
|
|
return -ENOLCK;
|
|
}
|
|
|
|
c->cfg.extra_len = 0;
|
|
if (c->iface->configure(c->iface, c->channel_id, &c->cfg)) {
|
|
dev_err(&c->dev, "Channel configuration failed. Go check settings...\n");
|
|
ret = -EINVAL;
|
|
goto err_put_module;
|
|
}
|
|
|
|
init_waitqueue_head(&c->hdm_fifo_wq);
|
|
|
|
if (c->cfg.direction == MOST_CH_RX)
|
|
num_buffer = arm_mbo_chain(c, c->cfg.direction,
|
|
most_read_completion);
|
|
else
|
|
num_buffer = arm_mbo_chain(c, c->cfg.direction,
|
|
most_write_completion);
|
|
if (unlikely(!num_buffer)) {
|
|
ret = -ENOMEM;
|
|
goto err_put_module;
|
|
}
|
|
|
|
ret = run_enqueue_thread(c, id);
|
|
if (ret)
|
|
goto err_put_module;
|
|
|
|
c->is_starving = 0;
|
|
c->pipe0.num_buffers = c->cfg.num_buffers / 2;
|
|
c->pipe1.num_buffers = c->cfg.num_buffers - c->pipe0.num_buffers;
|
|
atomic_set(&c->mbo_ref, num_buffer);
|
|
|
|
out:
|
|
if (comp == c->pipe0.comp)
|
|
c->pipe0.refs++;
|
|
if (comp == c->pipe1.comp)
|
|
c->pipe1.refs++;
|
|
mutex_unlock(&c->start_mutex);
|
|
return 0;
|
|
|
|
err_put_module:
|
|
module_put(iface->mod);
|
|
mutex_unlock(&c->start_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_start_channel);
|
|
|
|
/**
|
|
* most_stop_channel - stops a running channel
|
|
* @iface: pointer to interface instance
|
|
* @id: channel ID
|
|
* @comp: driver component
|
|
*/
|
|
int most_stop_channel(struct most_interface *iface, int id,
|
|
struct most_component *comp)
|
|
{
|
|
struct most_channel *c;
|
|
|
|
if (unlikely((!iface) || (id >= iface->num_channels) || (id < 0))) {
|
|
pr_err("Bad interface or index out of range\n");
|
|
return -EINVAL;
|
|
}
|
|
c = iface->p->channel[id];
|
|
if (unlikely(!c))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&c->start_mutex);
|
|
if (c->pipe0.refs + c->pipe1.refs >= 2)
|
|
goto out;
|
|
|
|
if (c->hdm_enqueue_task)
|
|
kthread_stop(c->hdm_enqueue_task);
|
|
c->hdm_enqueue_task = NULL;
|
|
|
|
if (iface->mod)
|
|
module_put(iface->mod);
|
|
|
|
c->is_poisoned = true;
|
|
if (c->iface->poison_channel(c->iface, c->channel_id)) {
|
|
dev_err(&c->dev, "Failed to stop channel %d of interface %s\n", c->channel_id,
|
|
c->iface->description);
|
|
mutex_unlock(&c->start_mutex);
|
|
return -EAGAIN;
|
|
}
|
|
flush_trash_fifo(c);
|
|
flush_channel_fifos(c);
|
|
|
|
#ifdef CMPL_INTERRUPTIBLE
|
|
if (wait_for_completion_interruptible(&c->cleanup)) {
|
|
dev_err(&c->dev, "Interrupted while cleaning up channel %d\n", c->channel_id);
|
|
mutex_unlock(&c->start_mutex);
|
|
return -EINTR;
|
|
}
|
|
#else
|
|
wait_for_completion(&c->cleanup);
|
|
#endif
|
|
c->is_poisoned = false;
|
|
|
|
out:
|
|
if (comp == c->pipe0.comp)
|
|
c->pipe0.refs--;
|
|
if (comp == c->pipe1.comp)
|
|
c->pipe1.refs--;
|
|
mutex_unlock(&c->start_mutex);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_stop_channel);
|
|
|
|
/**
|
|
* most_register_component - registers a driver component with the core
|
|
* @comp: driver component
|
|
*/
|
|
int most_register_component(struct most_component *comp)
|
|
{
|
|
if (!comp) {
|
|
pr_err("Bad component\n");
|
|
return -EINVAL;
|
|
}
|
|
list_add_tail(&comp->list, &comp_list);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_register_component);
|
|
|
|
static int disconnect_channels(struct device *dev, void *data)
|
|
{
|
|
struct most_interface *iface;
|
|
struct most_channel *c, *tmp;
|
|
struct most_component *comp = data;
|
|
|
|
iface = dev_get_drvdata(dev);
|
|
list_for_each_entry_safe(c, tmp, &iface->p->channel_list, list) {
|
|
if (c->pipe0.comp == comp || c->pipe1.comp == comp)
|
|
comp->disconnect_channel(c->iface, c->channel_id);
|
|
if (c->pipe0.comp == comp)
|
|
c->pipe0.comp = NULL;
|
|
if (c->pipe1.comp == comp)
|
|
c->pipe1.comp = NULL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* most_deregister_component - deregisters a driver component with the core
|
|
* @comp: driver component
|
|
*/
|
|
int most_deregister_component(struct most_component *comp)
|
|
{
|
|
if (!comp) {
|
|
pr_err("Bad component\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
bus_for_each_dev(&mostbus, NULL, comp, disconnect_channels);
|
|
list_del(&comp->list);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_deregister_component);
|
|
|
|
static void release_channel(struct device *dev)
|
|
{
|
|
struct most_channel *c = to_channel(dev);
|
|
|
|
kfree(c);
|
|
}
|
|
|
|
/**
|
|
* most_register_interface - registers an interface with core
|
|
* @iface: device interface
|
|
*
|
|
* Allocates and initializes a new interface instance and all of its channels.
|
|
* Returns a pointer to kobject or an error pointer.
|
|
*/
|
|
int most_register_interface(struct most_interface *iface)
|
|
{
|
|
unsigned int i;
|
|
int id;
|
|
struct most_channel *c;
|
|
|
|
if (!iface || !iface->enqueue || !iface->configure ||
|
|
!iface->poison_channel || (iface->num_channels > MAX_CHANNELS))
|
|
return -EINVAL;
|
|
|
|
id = ida_simple_get(&mdev_id, 0, 0, GFP_KERNEL);
|
|
if (id < 0) {
|
|
dev_err(iface->dev, "Failed to allocate device ID\n");
|
|
return id;
|
|
}
|
|
|
|
iface->p = kzalloc(sizeof(*iface->p), GFP_KERNEL);
|
|
if (!iface->p) {
|
|
ida_simple_remove(&mdev_id, id);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&iface->p->channel_list);
|
|
iface->p->dev_id = id;
|
|
strscpy(iface->p->name, iface->description, sizeof(iface->p->name));
|
|
iface->dev->bus = &mostbus;
|
|
iface->dev->groups = interface_attr_groups;
|
|
dev_set_drvdata(iface->dev, iface);
|
|
if (device_register(iface->dev)) {
|
|
dev_err(iface->dev, "Failed to register interface device\n");
|
|
kfree(iface->p);
|
|
put_device(iface->dev);
|
|
ida_simple_remove(&mdev_id, id);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < iface->num_channels; i++) {
|
|
const char *name_suffix = iface->channel_vector[i].name_suffix;
|
|
|
|
c = kzalloc(sizeof(*c), GFP_KERNEL);
|
|
if (!c)
|
|
goto err_free_resources;
|
|
if (!name_suffix)
|
|
snprintf(c->name, STRING_SIZE, "ch%d", i);
|
|
else
|
|
snprintf(c->name, STRING_SIZE, "%s", name_suffix);
|
|
c->dev.init_name = c->name;
|
|
c->dev.parent = iface->dev;
|
|
c->dev.groups = channel_attr_groups;
|
|
c->dev.release = release_channel;
|
|
iface->p->channel[i] = c;
|
|
c->is_starving = 0;
|
|
c->iface = iface;
|
|
c->channel_id = i;
|
|
c->keep_mbo = false;
|
|
c->enqueue_halt = false;
|
|
c->is_poisoned = false;
|
|
c->cfg.direction = 0;
|
|
c->cfg.data_type = 0;
|
|
c->cfg.num_buffers = 0;
|
|
c->cfg.buffer_size = 0;
|
|
c->cfg.subbuffer_size = 0;
|
|
c->cfg.packets_per_xact = 0;
|
|
spin_lock_init(&c->fifo_lock);
|
|
INIT_LIST_HEAD(&c->fifo);
|
|
INIT_LIST_HEAD(&c->trash_fifo);
|
|
INIT_LIST_HEAD(&c->halt_fifo);
|
|
init_completion(&c->cleanup);
|
|
atomic_set(&c->mbo_ref, 0);
|
|
mutex_init(&c->start_mutex);
|
|
mutex_init(&c->nq_mutex);
|
|
list_add_tail(&c->list, &iface->p->channel_list);
|
|
if (device_register(&c->dev)) {
|
|
dev_err(&c->dev, "Failed to register channel device\n");
|
|
goto err_free_most_channel;
|
|
}
|
|
}
|
|
most_interface_register_notify(iface->description);
|
|
return 0;
|
|
|
|
err_free_most_channel:
|
|
put_device(&c->dev);
|
|
|
|
err_free_resources:
|
|
while (i > 0) {
|
|
c = iface->p->channel[--i];
|
|
device_unregister(&c->dev);
|
|
}
|
|
kfree(iface->p);
|
|
device_unregister(iface->dev);
|
|
ida_simple_remove(&mdev_id, id);
|
|
return -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_register_interface);
|
|
|
|
/**
|
|
* most_deregister_interface - deregisters an interface with core
|
|
* @iface: device interface
|
|
*
|
|
* Before removing an interface instance from the list, all running
|
|
* channels are stopped and poisoned.
|
|
*/
|
|
void most_deregister_interface(struct most_interface *iface)
|
|
{
|
|
int i;
|
|
struct most_channel *c;
|
|
|
|
for (i = 0; i < iface->num_channels; i++) {
|
|
c = iface->p->channel[i];
|
|
if (c->pipe0.comp)
|
|
c->pipe0.comp->disconnect_channel(c->iface,
|
|
c->channel_id);
|
|
if (c->pipe1.comp)
|
|
c->pipe1.comp->disconnect_channel(c->iface,
|
|
c->channel_id);
|
|
c->pipe0.comp = NULL;
|
|
c->pipe1.comp = NULL;
|
|
list_del(&c->list);
|
|
device_unregister(&c->dev);
|
|
}
|
|
|
|
ida_simple_remove(&mdev_id, iface->p->dev_id);
|
|
kfree(iface->p);
|
|
device_unregister(iface->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_deregister_interface);
|
|
|
|
/**
|
|
* most_stop_enqueue - prevents core from enqueueing MBOs
|
|
* @iface: pointer to interface
|
|
* @id: channel id
|
|
*
|
|
* This is called by an HDM that _cannot_ attend to its duties and
|
|
* is imminent to get run over by the core. The core is not going to
|
|
* enqueue any further packets unless the flagging HDM calls
|
|
* most_resume enqueue().
|
|
*/
|
|
void most_stop_enqueue(struct most_interface *iface, int id)
|
|
{
|
|
struct most_channel *c = iface->p->channel[id];
|
|
|
|
if (!c)
|
|
return;
|
|
|
|
mutex_lock(&c->nq_mutex);
|
|
c->enqueue_halt = true;
|
|
mutex_unlock(&c->nq_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_stop_enqueue);
|
|
|
|
/**
|
|
* most_resume_enqueue - allow core to enqueue MBOs again
|
|
* @iface: pointer to interface
|
|
* @id: channel id
|
|
*
|
|
* This clears the enqueue halt flag and enqueues all MBOs currently
|
|
* sitting in the wait fifo.
|
|
*/
|
|
void most_resume_enqueue(struct most_interface *iface, int id)
|
|
{
|
|
struct most_channel *c = iface->p->channel[id];
|
|
|
|
if (!c)
|
|
return;
|
|
|
|
mutex_lock(&c->nq_mutex);
|
|
c->enqueue_halt = false;
|
|
mutex_unlock(&c->nq_mutex);
|
|
|
|
wake_up_interruptible(&c->hdm_fifo_wq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(most_resume_enqueue);
|
|
|
|
static int __init most_init(void)
|
|
{
|
|
int err;
|
|
|
|
INIT_LIST_HEAD(&comp_list);
|
|
ida_init(&mdev_id);
|
|
|
|
err = bus_register(&mostbus);
|
|
if (err) {
|
|
pr_err("Failed to register most bus\n");
|
|
return err;
|
|
}
|
|
err = driver_register(&mostbus_driver);
|
|
if (err) {
|
|
pr_err("Failed to register core driver\n");
|
|
goto err_unregister_bus;
|
|
}
|
|
configfs_init();
|
|
return 0;
|
|
|
|
err_unregister_bus:
|
|
bus_unregister(&mostbus);
|
|
return err;
|
|
}
|
|
|
|
static void __exit most_exit(void)
|
|
{
|
|
driver_unregister(&mostbus_driver);
|
|
bus_unregister(&mostbus);
|
|
ida_destroy(&mdev_id);
|
|
}
|
|
|
|
subsys_initcall(most_init);
|
|
module_exit(most_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Christian Gromm <christian.gromm@microchip.com>");
|
|
MODULE_DESCRIPTION("Core module of stacked MOST Linux driver");
|